Electric-arc lamp.



No. 644,85. Patented Mar. 6, I900.

- w. J. DAVY;

.ELEGTBIC ARC LAMP.

(Application filed. Kay 25, 1899.) (No lqiol.) 4 Sheets-Sheet 1-.

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No. 644,8!6. Patented Mar. 6, I900. W. J. DAVY.

ELECTRIC ARC LAMP.

(Application filed- May 26, 1899.)

4 Sheets-Sheet 2.

(No Model.)

Inventor.

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m. 644,8!6. Paiented Mar. 6, I900.-

, w. .1. DAVY.

ELECTRIC ABC LAMP.-

(Application filed. Kay 25, 1899.)

4 Sheets-Shebt 4.

. (No Model.)

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UNITED STATES PATE T OFFICE.

WILLIAM J. DAVY, oELoNnoN, ENGLAND, AssIeNo oF ONE-HALF To CHARLES WILLIAMSON MILNE, on SAME PLACE;

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent N 0. 644,816, dated March 6, 1906. Application file d Ma 25, 1899. smart. 718,260. (Nomads Ireland, residing at Drayton Park, Hi ghbury,

London, England, have inventedcertain new and useful Improvements in Electric-Are Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention forimprovements in inelosed electric-arc lamps has for its object to pro vide a simple, efficient, and cheap lamp having a good sealing and a small inclosed space and a bell and lower-carbon holder that can be easily cleaned and got at and it relates to the regulating and feed device, tothe means for fixing the inclosing bell in position, to the contact between the sliding carbon-holder and the fixed part of the lamp, to the attachment of the lower-carbon holder to the inclosing glass bell of the lamp, to the holding of the usual globe in position, and to the cutout.

In a lamp constructed according to this invention the inclosed chamber comprises the usual glass bell, the regulating-mechanism chamber against which the bell is firmly pressed, and a tube fixed centrally to the chamber opposite to the bell. The feed of th'e upper carbon is controlled by means of a rod passing into the mechanism-chamber. In order to regulate the feed of the upper carbon, the upper carbon passes through a central hole in a disk working in the mechanismchamber and loosely connected near its periphery to the controlling-rod. The regulating mechanism situated outside the inclosure comprises a sector-lever, over which passes a flexible cord or band connected at one end to the core of the regulating'solenoid and at the other end to the upper end of the regulating-rod. On the regulating-rod is the piston of a dash-pot, mounted on the top but at one side of the mechanism=chamber.'

The lever being sector-shaped always has the same leverage. The regulating-rod passes mechanism-chamber. The piston of the dashpot is made loose in its cylinder. Leakage. of air into the lamp can only take place through the dash-pot at its bushes or glands, and this leakage helps to control or dash the action; If the lamp is a differential lamp, the two cores of the solenoids may be arranged to counterbalance one another.

The upper-carbon holder slides in a tube fitted into the top of the mechanism-chamber and is closed at its upper end. In order to make contact between the sliding carbon holder and the tube, the carbon-holder con sists of a split metal cylinder, forming an annular series of spring-tongues that grip the carbon, and to it are riveted springs that pass upward and bear against the internal surface of the guide-tube. In order to still further insure the passage of the current to the upper carbon, a copper roller mounted on a link pivoted inside the mechanism-chamber bears on the carbon or, when the feed-disk is raised on the are being struck, on the feed-disk. The fixed carbon-holder is in a similar way split to form springjaws, and its exterior surface is tapered. A tapered bush fits on the tapered jaws and has a pin passing through the slits. To insert a carbon, the bush is raised to allow the jaws to spring outward. The carbon is then forced downward and by means of the pin forces down the bush and closes the jaws on itself.

The inclosing bell is drawn up against a flange on the lower face ofthe feed-disk cyl inder by means of links whose lower ends are turned upward into a recess in the metal fitting at the bottom of the bell and whose upper ends are attached to helical springs hung on insulated lugs on the frame and passing through insulating-pieces on the flange against which the bell is drawn. The metal fitting also carries the lower-carbon holder.

The usual globe is attached by clips to a.

ring that when the globe is inserted in place is pressed over spring-catches on the lamp casing.

The guide-tube is seated at its top by a cap that is connected to but insulated from a plate that is secured. to the cover or crownplate of the lamp.

The cut-out of the lamp is operated directly by the sector=shaped lever to break completely the shunt-circuit to save damage to the shuntcoil when the arc fails and so that if the carbons come together again the series coil thus acts to remake the circuit.

In the accompanying illustrative drawings, Figure 1 is a vertical section of an inclosed arc-lamp constructed according to this invention, and Fig. 2 is asectional elevation of the same. Figs. 3 and t are sectional plans on the lines 0000 and y y of Fig. 1. Figs. 5, 6, and 7 are respectively plan, elevation, and inverted plan of the top or sliding carbon holder. Fig. 8 is a section showing thelowercarbon holder. Figs. 9 and 10 are elevation and plan showing the shunt-circuit cut out as applied to a differentially-con trolled lamp. Fig. 11 is a diagrammatic view of the cut-out.

The frame or main structure of the lamp comprises the grip-chamber (I, containing the device that regulates the upper carbon, and the tube 1?, fixed in and opening into the up per end of the grip-chamber o and closed at its upper end.

The lower-carbon holder 0 is fixed to the bottom of the inclosing bell cl and the bell d is forced upward against a packing-washer d on the bottom of the grip-chamber by means of the loop or yoke e, that is formed at its center with a projection a, taking into a circular recess 0 in the bottom of the lower-carbon holder 0, and that has loops 6 at its upper ends, by which it is drawn upward by the spring-bolts e, that pass through insulatingbushes c on the plate (1 and hung on the insulating projections 6 fixed on the frameplate a. As shown, the packing-\msherdis inserted in a groove in a plate 61 secured to the flanges a of the grip-chamber by the screws C1 The yoke 6 also serves to convey the current to the lower-carbon holder.

The upper-carbon holderfslides in the tube Z), and the uppercarbon is controlled by a disk g, havinga central hole g, through which the carbon passes. The disk 9 works in the gripchamber a and is loosely connected near its periphery to the controlling-rod h and rests opposite to the rod h on the stop C62. If the .rod his moved upward, it cants the disk 9 and causes it to grip the carbon and then to raise it to strike the arc, at the same time raising the disk 9 off the stop a On the descent of the rod the disk g comes in contact with the stop a and partially releases the carbon ,which feeds steadily through the disk.

The regulating mechanism situated outside the inclosure comprises a lever i, fulcrumed at t" on a bush 1), fixed on the tube 7). The lever 1' is connected on opposite sides of its fulcrum by the flexible connections 2' to the solenoid-core Z and to the controlling-rod 71, the cords 11 passing over the curved surfaces t' i, so that the leverage is constant.

On the top of the grip chamber a at one side is the'dash-pot cylinder m, and the controlling-rod 7i passes centrally through the cylinder m and has fixed on it the dash-pot piston m. The rod is guided in the bushes m m and the upper bush m is surrounded by a silk bag m that is also tied to the rod, so as to keep out all dust. Leakage of air into the inclosed chamber can only take place through the upper bush m and as the leakage only occurs when the lamp is subjected to sudden or excessive variation it helps to control or dash the action.

In order to make good and efficient contact between the upper-carbon holder fand the tube 1), the upper-carbon holder is formed out of a cylinder closed at its upper end and split from the bottom toward the top to form tongues f. Springs f are riveted to the bottoms of the tongues and pass upward, their outer endsf bearingagainst the internalsurface of, the tube 7). In order to still further insure the passage of the current to the upper carbon, a copper roller 02 is mounted on a link it, pivoted at n inside the mechanism-chamber. The length of the link it is such that when the lamp is at rest (the disk 9 not gripping the carbon) the roller rests directly on the carbon and conveys the current to it. When, however, the disk is raised, the roller bears on the disk, as indicated in dotted lines, and conveys the current to the carbon through the disk.

The negative carbon-holder consists of piece 0, having the recess 0 at its bottom for the projection c of the yoke e and the flange 0 that bears against the inside of the bell d. The nut c secures the piece 0 to the bell. The upper end of the piece 0 is bored out to fit the negative carbon and is split to form spring-jaws c, and its exterior surface is tapered. The tapered bush 0 fits 011 the tapered jaws c and has a pin 0 passing through the slits. To insert a carbon, the bush is raised to allow the jaws to spring outward, and the carbon is then forced downward and by means of the pin 0 forces down the bush and closes the jaws on itself.

Figs. 9 and 10 show the shunt cut out as applied to a differential lamp for a series circuit. The cut-out lever Z is fulcrumed at on a neck-ring b clamped upon the main tube 17, but insulated therefrom by the ring 19 This neck-ring carries the springcontact of the cut-out insulated from the neck-ring by the strip 70. The projections Z Z on the lever Z allow the main lever i to engage it, and one of these projections Z forms part of the switch-making contact with the springj. In Fig. 9 the shunt-circuit is shown broken and the-lever i is drawn down to its full position by the sh unt-eoil previously to breaking circuit. One end of the shunt-coil is connected to the negative terminal of the lamp, the other end of the shunt being connected to the spring j. The lever Z is connected to the tube 1), and when the lever Z is operated by the engagement of the lever 11 andprojection Z the shunt-circuitis broken at the switch Z j. Whenthe lamp rights itself-say by the carbons falling together and completing the series circuit the lever t is oscillated and re forms the shuntcircuit by oscillating the lever Z. This is done quickly, as the shunt-circuit being open does not act against the series coil. The usual globe o is attached by the clips 0 to the ring 0 and when the globe 0 is inserted in place the ring'o is forced past the spring-catches 0 that spring under the ring and hold it. The catches o are withdrawn when desired to remove the globe by means of the extension 0 The tube b is sealed at its top by a cap 11 and is connected to but insulated from the plate 19 by the bolt 19, passing through the insulatingbush p and having the insulating-washers 19 The plate 19 is secured to the canopy or cover-plate p by the screwsp The current enters the lamp at and passes around the series coil, and thence to the framework at 7" through. the carbons, yoke e, insulated terminals 0", insulated terminal 1", and out at The shuntcoils are connected across the and M poles of the 1amp,.one wire to the terminal or frame and the other to the terminal.

What I claim, and desire to secure by Letters Patent, is-- 1. In an inclosed arc-lamp in which the carbon tends to feed forward, the feed-mechanism chamber closed at its ends, a transparent inclosing bell bearing against one end of the chamber, a carbon passing through this end of the chamber into the inclosing bell, a disk fitting loosely in the mech anism-chamber and having a hole through which the carbon passes freely, a regulating-rod loosely attached to the disk near its periphery, a stop adapted to limit the motion of the disk at an opposite point of the periphery, and a means for determining the position of the rod according to the resistance of the arc.

2. An inclosed arc-lamp consisting of the carbon guide-tube closed at one end, the feedmechanism chamber attached at one end to the other end of the guide-tube, a transparent inclosing bell bearing against the other end of the chamber, a dash-pot fixed on the end at one side of the chamber, a piston working in the dash-pot and a rod fixed to the piston passing into the mechanism-chamber t0 operate the feed device therein and passing outward to the regulating mechanism the whole forming an inclosed chamber in which any transference of gases has to take place through the dash-pot.

3. The means for fixing the inclosing bell in position consisting of a fitting fixed on the end of the bell opposite to its mouth and provided at its outer end with a recess, a loop or double yoke having a projection bearing in the recess and side arms, and spring-bolts hung on the lamp-frame and a swivel-joint connecting the side arms of the yoke to the spring-bolts.

4. The carbon-holder consisting of a split cylinder forming tongues adapted to grip the carbon and spring-contacts riveted at one end to the tongues and bearing at the other end on the carbon guide-tube.

5. The negative carbon-holder comprising the split socket with tapered exterior surface and an internally-tapered bush fitting on the tapered jaws and having a pin adapted to pass through the slits in the socket.

G. The means for conveying current to the movable carbon consisting of a contact-roller,-

a link carrying the contact-roller and a piece fixed to the feed devices that raises the roller of the carbon. when the feed devices are oper ative.

7. The shunt cut-out device comprising a cut-out lever fulcrumed to an. insulated ring on the main tube and capable of being engaged by the main lever, an insulated springcontact plate forming with the cut-out lever the cut-out switch, and a shunt-coil one end of which is connected to the negative terminal of the lamp While the other end is connected to the spring-contact.

In testimony whereof I affix'my signature in presence of two witnesses.

WILLIAM J. DAVY.

. Witnesses:

ALBERT J ONES, HARRY W. BAILEY. 

